IIS and Apache/Wamp are both web server and might conflict in some way, so you have to disable IIS in order for Wamp to work
Disable IIS in Vista/7:
Control Panel, Uninstall Programs, Turn Widows Features On or Off, uncheck Internet Information Services
Disable IIS in XP:
Control Panel, Add/Remove Programs, Add/Remove Windows Components, uncheck Internet Information Services (IIS)
Restart computer, then restart Wamp
Also, open file hosts in folder C:\WINDOWS\System32\drivers\etc and delete anything in there and have only this line and nothing else
127.0.0.1 localhost
if using skype, open skype > tools>options>advanced>connection and uncheck "use port 80..." then restart wamp then skype
Have fun,
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